/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Sampling/MeshBakerCommon.h
Compute interpolated vertex color value inside triangle using barycentric coordinates
true if a valid vertex color was returned, false otherwise
virtual bool TriBaryInterpolateColor ( const void * Mesh, const int32 TriId, const FVector3d & BaryCoords, FVector4f & ColorOut ) const